Wednesday, April 25, 2007

HW #7, P4 - ΔSSys, ΔSRes, and ΔSUniv, for a H.T. Process - 3 pts

During the isothermal heat addition process of a Carnot Cycle, 900 kJ of heat is added to the working fluid from a source at 400oC. Determine:

a.) the entropy change of the working fluid
b.) the entropy change of the heat source
c.) the total entropy change of the universe for this process.

1 comment:

Dr. B said...

A student asked me...
"I'm not exactly sure how to factor in the mass of the working fluid, with the given values of Q and T. Should that be a specific thermal heat of 900 kJ/kg given to us? It makes more sense that way."

I answered...
I think your confusion comes from the INCORRECT units on my answers. The units should be kJ/K. there is no mass of fluid in this problem. Sorry for the confusion. I will fix the answer on Moodle now.